Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

That is possible. A lot of guys have no interest in learning how an economizer works, or how to troubleshoot it.

So true. Economizers have kept me very busy during the winter over the years. On many new accounts I often find enthalpy sensors disconnected with nothing else wrong. I tell young guys to learn about them because they generate work for the cold months when some get slow. I urge guys to not look at the controller and get overwhelmed. I tell them to break each circuit down and things get much less complicated. That is of course once they get an understanding of them

Economizer would disable 1st stage mechanical cooling if outdoor conditions were suitable (sounds like they are) for free cooling. Suction line freeze stat on 2nd stage compressor or Low ambient thermostat for 2nd stage lockout. These units are not designed to protect the compressors from ANY unit malfunction.

Last edited by Cold shot; 12-31-2012 at 06:15 PM.
Reason: incorrectly described the product that was being talked about.

Economizer would disable 1st stage mechanical cooling if outdoor conditions were suitable (sounds like they are) for free cooling. Suction line freeze stat on 2nd stage compressor or Low ambient thermostat for 2nd stage lockout. These units are not designed to protect the compressors from ANY unit malfunction.

Just to prevent any confusion, when second stage cooling is energized while a system is economizing, first stage compressor energizes and comes on (compressor 1 and not compressor 2)

## + years in the field never made you a know-it-all This industry is far more diverse than you are